feietsch



(No Model.)

K. G. PRIETSGH.

GOMMUTATOR BRUSH.

No. 448,331. Patented Mar. 17, 1891..

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UMTED STATES PATENT OEEIQE.

KARL G. FRIETSOH, OF SCHENEUPADY, ASSIGNOR TO THE EDISON MACHINE \YORKS, OF NEYV YORK, N. Y.

COMMUTATOR-BRUSH.

SPECIFECATION forming" part of Letters Fatent No. 448,831, dated March 17, 1891.

Application filed June 28,1890. Serial No. 357,073. (No model.

To all whom 11! may concern:

Be it known that I, KARL GUSTAF FErErscn, a citizen of the Grand Duchy of Finland, residing at Schenectady, in the county of Schen- 5 ectady and State of New York, have invented a certain new and useful lm provem entin Coniniutator- Erushes, of which the following is a specification.

The invention relates to devices for collect ing the current generated in a dynamo or magneto-electric machine and delivering the same to the translating-eircuit, or for delivering the current from a supply-circuit to the armaturecoil of an electric motor; and the invention consists in an improved brush having a carbon or other suitable contact-piece, which is automatically fed forward as it wears away by an adjustable spring-pressure, the current passing from the carbon contact near the commutator surface to a second brush of copper or other high conducting material; and the invention further consists in features of construction and combinations, as hereinafter described and claimed.

In the accompanying drawings, which illustrate the invention, Figure l is a side view, partly in section, of a comm utator-brush. Fig. 2 is a detail of the copper-brush holder. Fig. :3 is a rear end view of the brush, partly in 0 section. Fig. l: is a side view of the copper brush, and Fig. 5 is a top view of the same.

The circle 1. indicates a commutator-cylinder of any well-known or suitable construction.

5 2 is an adjustable rod or pintle, movable in the arc of a circle around the commutatorcylinder and carrying one commutator brush, whereby the position of the brush on the commutator-cylinder can be changed to 0 regulate the generator or motor. It will be understood that a corresponding pintle on the opposite side of the commutator-cylinder carries a second brush of the same construction in the ordinary manner.

3 is a carbon block, hereinafter termed the contact brush, one end of which bears against the commntator-cylinder. This contact-brush is supported in the holder at, which in turn is supported by the pintle 2.

5 is a second brush or conductor, hereinafter termed the line-brush, one end of which bears upon the carbon block near its contact end. The other-end of thelinebrush is supported in the socket 6, and is clamped in place by a suitable bolt 7, which preferably passes through a slot 8 in the end of the brush. The brush 5 is preferablyconstructed of sheet-copper and layers of copper wire alternating, the outer layers being sheet-copper. The line-wire maybe clamped between the brush and the bolt-head. The holder is cut away at 9, as indicated in the drawings.

10 is a frame or device, the inner end of which rests against the contact-brush.

11 is a cross-rod, to one or both ends of which is connected aspring 12, the other end of which is coiled around that part of the holder which is journaled on the pintle 2, the holder being suitably formed to receive the spring, as shown in the drawings. The springs terminate at 13, and above or outside of the spring is a cross-piece 1t, adjustable by means of a bolt 15 and thumbscrew 16, whereby the tension of the springon the contrct-brush may be varied.

It will be seen that by grasping the rear end of the frame 10 it can be retracted and held in the position indicated by dotted lines for the removal of the contact-brush or for any other purpose desired. The springs rest in notches 17, which notches prevent the forward movement of the frame beyond a certain limit, as will be evident.

To remove the contact-brush'from the com nnitator-surface, the screw 18 is retracted and 8 5 the holder turned on its pintle until the end of the screw comes in line with the bearingsurface 10, when the screw is again turned forward. This throws the lower end of the holder and the contact-brush away from the com1nutator-cylinder.

20 are thin sheets of copper, and 2]. are layers of copper wires, preferably longer than the copper sheets. The copper plates and wires are preferably soldered together between the points 22 22, and a band is placed around the brush at 23, which serves to hold the wires from displacement, at which point v of a carbon block supported in a suitable holder, one end of the block bearing'against the commutator-cylinder, a spring for pressing the block forward, and a line-brush of high conductivity bearing against the block near its contact end, substantially as described.

3. The combination, in acommutator-brush, of a pintle or support, a holder carried thereby, a contact-brush in the holder and adapted tobearlongitudinallyagainstthe commutatorcylindenand asecond brush making contact with one side of the first brush and connected directly to line, substantially as described.

4. The combination,in acommutator-brush, of the pintle 2, the holder and the line-brush adj ustably held thereon, the carbon contactbrush in the holder, the framebearing against said brush, and springs the tension of which holds the frame against the brush, substantially as described.

5. The combination, in a commutator-brush, of the pintle, the holder supported thereon, the line-brush, the carbon contact-brush in the holder, the frame bearing against said brush, springs the tension of which holds the frame against the brush, and means for adjusting the tension of the springs, substantially as described.

6. The combination, in acommutator-brush, of the holderat, the contact-brush therein, the line-brush bearing on the contact-brush, the device bearing against thecontact-brnsh and the springs for pressing the same forward, and means for retracting said device and holding the same, substantially as described.

7. The combination of the holdersnpported on the pintle, the springpressed contactbrush, the line-brush, and means for retracting and holding the contact-brush from the commutator-cylinder, substantially as described.

This specification signed and witnessed this 19th day of June, 1890.

' KARL G.. FRIETSOH.

Witnesses:

E. KOLBEN, H. F. T. ERBEN. 

